1. LINAC4 commissioning plans etc.
Alessandra Lombardi
on behalf of the LINAC4 team
OP DAY - 26th January 2012 Archamps

2. OP DAY - 26th January 2012 Archamps
Preinjector
3 MeV
Source(s)
2 solenoids
RFQ
11 EMQ
3 Cavities
2 Chopper units
dump
352 MHz
Π-mode Structure
160 MeV
12 Modules
8 Klystrons
12 EMQ
12 steerers
23 m
Cell-Coupled Drift Tube Linac
100 MeV
7 Modules
7 Klystrons
7 EMQ
7 steerers
14 PMQ
25 m
Drift Tube Linac
50 MeV
3 Tanks
3 Klystrons
1 EMQ
2 steerers
114 PMQ
19 m
OP DAY - 26th January 2012 Archamps

3. A. Lombardi – LINAC4 as BKP for LINAC2 – IEFC workshop -23 march 2011
Layout of LINAC4
45keV
3MeV
50MeV
102MeV
RFQ
MEBT
DTL
CCDTL
PIMS
Radio Frequency Quad.
352.2MHz
3 m
Low Energy beam transport
2 solenoid
1.8 m
11 EMQ
3 Cavities
2 Chopper units.
3.9 m
Drift Tube Linac
3 Tanks
114 PMQ
1 EMQ
19 m
Cell-Coupled Drift Tube Linac
7 Modules
7 EMQ
14 PMQ
25 m
Π-mode Structure
12 Modules
12 EMQ
22.9 m
LEBT H-
160MeV
Up to 3 MeV “charge insensitive”
In the MEBT line we have to respect the chopping dynamics
We need to match to a permanent focusing channel in the DTL and CCDTL
A. Lombardi – LINAC4 as BKP for LINAC2 – IEFC workshop -23 march 2011

4. OP DAY - 26th January 2012 Archamps
“The source(s)”
45 keV beam available
aug 2012
mid 2013
after 2015
OP DAY - 26th January 2012 Archamps

5. OP DAY - 26th January 2012 Archamps
Preinjector
3 MeV
Source(s)
2 solenoids
RFQ
11 EMQ
3 Cavities
2 Chopper units
dump
352 MHz
Π-mode Structure
160 MeV
12 Modules
8 Klystrons
12 EMQ
12 steerers
23 m
Cell-Coupled Drift Tube Linac
100 MeV
7 Modules
7 Klystrons
7 EMQ
7 steerers
14 PMQ
25 m
Drift Tube Linac
50 MeV
3 Tanks
3 Klystrons
1 EMQ
2 steerers
114 PMQ
19 m
OP DAY - 26th January 2012 Archamps

6. OP DAY - 26th January 2012 Archamps
Transfer Line
70deg towards LINAC2 or to DUMP
Up 2.5 m step to level with PSB
OP DAY - 26th January 2012 Archamps

7. OP DAY - 26th January 2012 Archamps
Nominal Beam at PSB
Intensity
40 mA
Transverse
Ε= pi mm mrad norm rms
Alpha= 0
Beta x = 5,2.5,10 m
Beta y = 4,2,8 m
Dispersion = 0 or 1.2 m
Longitudinal
±100 keV rms energy spread ( KeV possible)
160 MeV ± 1.2 MeV (dynamically over 20 µsec)
Chopped
1 µsec for the distributor rise time
1 MHz frequency of the PSB
as low as just letting few µbunches (50 nsec)
OP DAY - 26th January 2012 Archamps

8. OP DAY - 26th January 2012 Archamps
What needs to be set
EFFECT ON
Focusing
LEBT solenoids (2)
Intensity and Transverse Emittance
MEBT quadrupoles (11)
Chopping efficiency
DTL CCDTL PIMS quads (22)
Intensity
Transfer Line quadrupoles
(15+18)
Intensity , Matching and Dispersion
Steering
Steerers hor and vert (36) RF
Phase and Amplitudes
(22)
Energy, energy spread
OP DAY - 26th January 2012 Archamps

9. OP DAY - 26th January 2012 Archamps
Stages
Energy
Key issue
Completed in the tunnel by
LINAC4 stand alone
3MeV
RFQ transmission
Chopping
May 2013
12 MeV
Matching to DTL
Sep 2013
30-50 MeV
Transporting in PMQ channel
Dec 2013
100 MeV
Setting the RF phases
Mar 2014
160 MeV - DUMP
Reliability
End 2014
Connection to PSB
160 MeV –LBE LBS
T0+8months
OP DAY - 26th January 2012 Archamps

10. Movable Temporary Benches
Low energy bench
(up to 12 MeV)
Spectrometer (0.2 %)
Slit and Grid Emittance
ToF (calibration)
Bunch Shape Monitor
Halo Monitor (chopping eff.)
Medium energy bench
(up to 100 MeV)
ToF (0.1 %)
Emittance via Profiles
Bunch Shape Monitor
OP DAY - 26th January 2012 Archamps

11. Permanent Measurement Line
4 profile monitors (emittance)
Bunch shape monitor (phase spread)
OP DAY - 26th January 2012 Archamps

12. OP DAY - 26th January 2012 Archamps
At 160 MeV on the DUMP
Fine tuning of the whole LINAC
Operational beam parameters at the end of the LINAC to be used as an input to rematch the line and prepare a fast commissioning of the lines.
Reliability run
OP DAY - 26th January 2012 Archamps

13. OP DAY - 26th January 2012 Archamps
Refurbished LBE LBS
Emittance via Q-scan
Energy spread and energy swing
Draft !
OP DAY - 26th January 2012 Archamps

14. What have done so far +83mm Drift Emittance Meter Solenoid Steerer
Iris
Faraday Cup
Pre Chopper
SEM-Grid
BCT
Slit

15. RFQ acceptance vs. Measured emittance
What have done so far
RFQ acceptance vs. Measured emittance
Measured after source vs. Measured at the RFQ input plane and backtracked to the source
OP DAY - 26th January 2012 Archamps

16. OP DAY - 26th January 2012 Archamps
What if…we need 50MeV p
Need DTL + CCDTL module 4 + all the quadrupoles – not before end 2014
Switch the source to P mode and complete installation new transfer line
Reposition BHZ20
E = 0.28 pi rms norm
DW=100 keV (1rms)
40 mA
50MeV
400 μsec
OP DAY - 26th January 2012 Archamps

17. OP DAY - 26th January 2012 Archamps
Support from OP
Software – for diagnostics applications – coordinated by Giulia Bellodi
Participation to commissioning of the LINAC ( 3 teams of 3 people with 1 LINAC expert, 1 RF expert , 1 operator) , work on the basis of 2 shifts/day during 2013/2014.
18 man.month of experienced operators (=6 months * 3 operators) in 2013/14 available for Linac4 commissioning. To be aligned with commissioning schedule.
Who is going to operate LINAC4 and from where?
OP DAY - 26th January 2012 Archamps

18. OP DAY - 26th January 2012 Archamps
Connection to PSB
Need 8 months / LHC stop of 6 months
Ready from 2015 (Linac4 must be already commissioned)
OP DAY - 26th January 2012 Archamps

19. OP DAY - 26th January 2012 Archamps
Summary
Plan for commissioning LINAC4 in 5 stages with two temporary measurement benches. We believe that we have sufficient diagnostics to set all the linac parameters (about 130) . Energy spread can be measured properly only at 12 MeV and in the LBS.
The present schedule foresees end of commissioning + reliability run at the end of 2014
From 2015 LINAC4 can be connected to the PBS
Need a shutdown of 8 months for the connection
OP DAY - 26th January 2012 Archamps